technicaslly it is dustilled, distillation is a process of puricication based on differences in boiling points, but i wouldnt drink it, bonging it would be redundant, but you could put the bong outside...
but then you may aswell make a thingy that fills your bong with wwater when it goes low from teh outside spicket, using a valve or something, you wouldnt be saving much bby using dehum water.
why no use electrolisis to seperate 02 hrom h, then use a power cell witch combines them and get power out of it, to power a pelt system for your laptop or pda.....